Electrostatic discharge protection circuit

Details Electrostatic discharge protection circuit Electrostatic discharge protection circuit

1993-06-02

1995-05-02

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361111, 361118, H02H 904

Patent

active

054125278

ABSTRACT:
A circuit which protects against damage to an integrated circuit caused by electrostatic discharge (ESD) includes a resistor connected at one end to an input pad, and a pair of back-to-back Schottky diodes connected to the other end of the resistor. The cathodes of the Schottky diodes are connected to each other by a common semiconductor substrate and connected to a supply voltage. The anode of one of the Schottky diodes is grounded, and the anode of the other Schottky diode is connected to a node in common with the other end of the resistor and a circuit component to be protected from an ESD spike. The Schottky diodes, when forward biased by an ESD spike, do not inject minority carriers into the substrate. In this way, unwanted PNP, NPN, or four-layer diode problems are avoided and recovery from an ESD spike is rapid.

REFERENCES:
patent: 4513309 (1985-04-01), Cricchi
patent: 4930036 (1990-05-01), Sitch

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